• $100

Emitter
■ Frequency: 433.92MHz
■ Power supply: One 3V CR2430 battery
■ Battery life: 2 years (rated power 210MAH)
■ Launch distance: 150m
■ Size: 145 * 47.7 * 16.6mm

https://www.wistarmotor.com/product/control-unit/emitter/wsre101.html